Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis and Characterization of Poly(pyridinium salt)s with Organic Counterion Exhibiting Both Lyotropic Liquid-Crystalline and Light-Emitting Properties†Pradip K. Bhowmik, Ronald A. Burchett, Haesook Han, and James J. CebeView Au…
Ultramafic (serpentinized) rocks are parent materials for some soils in the Klamath Mountains in southwestern Oregon. Two map units in Curry County Soil Survey (e.g., Serpentano and Snowcamp) have typical vegetation and characteristics of serpentine soils, with low productivity and sparse stands of trees and slope sta…
MDP-1 is a eukaryotic magnesium-dependent acid phosphatase with little sequence homology to previously characterized phosphatases. The presence of a conserved motif (Asp-X-Asp-X-Thr) in the N terminus of MDP-1 suggested a relationship to the haloacid dehalogenase (HAD) superfamily, which contains a number of magnesium…
The kinetics of solid-state polymerization (SSP) of poly(bisphenol A carbonate) was investigated with supercritical CO 2 (scCO 2 ) as the sweep fluid. The CO 2 flow rate and polymer particle size were chosen to ensure that the kinetics was controlled by the rate of the forward transesterification reaction, i.e., so th…
The synthesis and full characterization of [(tmc)MnCl]·X (where tmc is 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane and X is BPh4- or BF4-) are reported. The complex is of type I geometry. The manganese ion is pentacoordinated by the four tertiary nitrogen atoms of the macrocycle and one axial chloride. Vari…
We report a new force field for calcite suitable to study scale formation and squeeze treatments for oil field applications. The force field reproduces the cell parameters, density, and the compressibility of the calcite crystal as well as the enthalpy of immersion of various solvents. Surface energetics for the vario…
The quality of imaging subwavelength features with the aid of multilayers containing negative permittivity materials is examined. Examples for nearly perfect imaging are given and limitations discussed. Spatial compression (image narrower than object) is shown to be possible and a qualitative physical picture based on…
Abstract Star‐shaped polymers can be synthesized by condensation of linear polymers to dendritic cores. The distribution of molecular masses of such hybrid star polymers and the factors influencing it have been investigated by calculations based on population balance equations and Laplace transformations. Moreover, th…
The manufacture of biodegradable materials from agricultural sources is a real challenge, because of environmental concerns and the need to make full use of resources. Cottonseed is an important protein source that could be used in nonfood applications, as a substitute for synthetic polymers. For the first time, the v…
The interaction of cationic lanthanide complexes [Ln(porp)(H2O)3]+ (Ln = Er or Yb; porp = porphyrinate) with sodium (cyclopentadienyl)tris(diethylphosphito)cobaltate (NaLOEt) gives the neutral 3d–4f bi-metallic porphyrinate complexes, [(LOEt)Ln(porp)]. X-Ray structural analyses reveal that these complexes are seven-co…
Fluorinated dendritic or hyperbranched polymers are demonstrated for the first time to be potentially useful for optical waveguide applications, for example in telecommunications. The required materials properties include the control of the refractive index over a wide range and UV-crosslinking for ease of processing…
A structural analysis of CaSO4 · 0.5H2O, a dehydration product of gypsum, has been carried out \nthrough the Rietveld method on X-ray powder diffraction data. A dehydrated powder of synthetic gypsum has \nbeen charged inside a non-hermetically sealed capillary in order to allow a slow rehydration. The starting…
The molecular inorganic compounds 1,3,5-{ trans -[RuCl(dppe) 2 ]C⋮C-4-C 6 H 4 C⋮C} 3 C 6 H 3 ( 1 ), trans -[Ru(C⋮C-4-C 6 H 4 C⋮CPh)Cl(dppe) 2 ] ( 2 ), and trans -[Ru(C⋮CPh)Cl(dppm) 2 ] ( 3 ) exhibit reversible oxidation in solution, assigned to the metal-centered Ru II/III processes. Complexes 1 − 3 are essentially tr…
Fluorinated poly(arylene ether sulfide)s containing an ethynyl group (E-FPAESI) were synthesized by nucleophilic aromatic substitution from 4,4‘-(hexafluoroisopropylidene)diphenol (6FBPA) and an excess of pentafluorophenyl sulfide, followed by reaction with 3-ethynylphenol. The molecular weights ( M n 's) and polydisp…
We study the behavior of colloidal particles suspended in a thermotropic nematic solvent in the presence of an electric field. For normal boundary conditions of the nematic director at the particles' surface, we show experimentally that an electric field applied along the dipolar axis of an elastic dipole induces a tr…
The microporosity of the heat-treated single-wall carbon nanohorn (SWNH) particles is characterized by nitrogen adsorption at 77 K and the molecular potential calculation using the function, which is based on the Lennard-Jones pair potential. The depth difference of the molecular potential for N 2 between the SWNH int…
A new method for producing well-defined porous materials by templating scCO2 emulsions is revealed here. The technique involves forming a high internal phase emulsion (HIPE) and locking in the structure of the “external” phase. By this method it is also possible to produce templated, crosslinked poly-(vinyl alcohol) (…
We present a study on the power dependence of the microwave surface impedance in thin films of the novel superconductor MgB2. 500 nm thick samples exhibiting critical temperatures ranging between 26 and 38 K are synthesized by an ex-situ post-anneal of e-beam evaporated boron in the presence of an Mg vapor at 900 C. P…
Abstract Crystallization studies at quiescent and shear states in isotactic polypropylene (iPP) containing nanostructured polyhedral oligomeric silsesquioxane (POSS) molecules were performed with in situ small‐angle X‐ray scattering (SAXS) and differential scanning calorimetry (DSC). DSC was used to characterize the q…
The reaction of M(ox) x 2H(2)O (M = Co(II), Ni(II)) or K(2)(Cu(ox)(2)) x 2H(2)O (ox = oxalate dianion) with n-ampy (n = 2, 3, 4; n-ampy = n-aminopyridine) and potassium oxalate monohydrate yields one-dimensional oxalato-bridged metal(II) complexes which have been characterized by FT-IR spectroscopy, variable-temperatu…